What is the value of 2sin(22.5)cos(22.5) ?

The value of 2sin(22.5)cos(22.5) is (sqrt(2))/2

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2sin(22.5)cos(22.5)

2 sin (22. 5^{\circ}) cos (22. 5^{\circ})

\frac{2}{2}

Decimal Notation

0.70710 \dots

Solution steps

2 sin (22. 5^{\circ}) cos (22. 5^{\circ})

Rewrite using trig identities:

sin (4 5^{\circ})

2 sin (22. 5^{\circ}) cos (22. 5^{\circ})

Use the Double Angle identity:

2 sin (x) cos (x) = sin (2 x)

= sin (2 \cdot 22. 5^{\circ})

Simplify

= sin (4 5^{\circ})

= sin (4 5^{\circ})

Use the following trivial identity:

sin (4 5^{\circ}) = \frac{2}{2}

sin (4 5^{\circ})

sin (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

= \frac{2}{2}

= \frac{2}{2}

arcsin (- 0.5)

2 cos (4 5^{\circ})

tan (40 5^{\circ})

arcsin (0.4)

cos (\frac{3}{4} π)

What is the value of 2sin(22.5)cos(22.5) ?
The value of 2sin(22.5)cos(22.5) is (sqrt(2))/2